Gabriele Cosmo
306 lines
9.9 KiB
C++
306 lines
9.9 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// $Id: G4ContinuousGainOfEnergy.cc,v 1.5 2010/11/11 11:51:56 ldesorgh Exp $
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// GEANT4 tag $Name: geant4-09-04 $
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//
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#include "G4ContinuousGainOfEnergy.hh"
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#include "G4Step.hh"
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#include "G4ParticleDefinition.hh"
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#include "G4VEmModel.hh"
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#include "G4VEmFluctuationModel.hh"
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#include "G4VParticleChange.hh"
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#include "G4UnitsTable.hh"
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#include "G4AdjointCSManager.hh"
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#include "G4LossTableManager.hh"
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///////////////////////////////////////////////////////
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//
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G4ContinuousGainOfEnergy::G4ContinuousGainOfEnergy(const G4String& name,
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G4ProcessType type): G4VContinuousProcess(name, type)
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{
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linLossLimit=0.05;
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lossFluctuationArePossible =true;
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lossFluctuationFlag=true;
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is_integral = false;
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//Will be properly set in SetDirectParticle()
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IsIon=false;
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massRatio =1.;
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chargeSqRatio=1.;
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preStepChargeSqRatio=1.;
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}
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///////////////////////////////////////////////////////
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//
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G4ContinuousGainOfEnergy::~G4ContinuousGainOfEnergy()
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{
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}
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///////////////////////////////////////////////////////
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//
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void G4ContinuousGainOfEnergy::PreparePhysicsTable(
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const G4ParticleDefinition& )
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{//theDirectEnergyLossProcess->PreparePhysicsTable(part);
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;
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}
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///////////////////////////////////////////////////////
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//
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void G4ContinuousGainOfEnergy::BuildPhysicsTable(const G4ParticleDefinition&)
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{//theDirectEnergyLossProcess->BuildPhysicsTable(part);
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;
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}
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///////////////////////////////////////////////////////
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//
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void G4ContinuousGainOfEnergy::SetDirectParticle(G4ParticleDefinition* p)
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{theDirectPartDef=p;
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if (theDirectPartDef->GetParticleType()== "nucleus") {
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IsIon=true;
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massRatio = proton_mass_c2/theDirectPartDef->GetPDGMass();
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G4double q=theDirectPartDef->GetPDGCharge();
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chargeSqRatio=q*q;
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}
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}
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///////////////////////////////////////////////////////
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//
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//
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G4VParticleChange* G4ContinuousGainOfEnergy::AlongStepDoIt(const G4Track& track,
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const G4Step& step)
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{
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//Caution in this method the step length should be the true step length
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// A problem is that this is compute by the multiple scattering that does not know the energy at the end of the adjoint step. This energy is used during the
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//Forward sim. Nothing we can really do against that at this time. This is inherent to the MS method
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//
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aParticleChange.Initialize(track);
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// Get the actual (true) Step length
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//----------------------------------
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G4double length = step.GetStepLength();
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G4double degain = 0.0;
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// Compute this for weight change after continuous energy loss
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//-------------------------------------------------------------
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G4double DEDX_before = theDirectEnergyLossProcess->GetDEDX(preStepKinEnergy, currentCouple);
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// For the fluctuation we generate a new dynamic particle with energy =preEnergy+egain
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// and then compute the fluctuation given in the direct case.
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//-----------------------------------------------------------------------
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G4DynamicParticle* dynParticle = new G4DynamicParticle();
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*dynParticle = *(track.GetDynamicParticle());
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dynParticle->SetDefinition(theDirectPartDef);
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G4double Tkin = dynParticle->GetKineticEnergy();
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size_t n=1;
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if (is_integral ) n=10;
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n=1;
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G4double dlength= length/n;
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for (size_t i=0;i<n;i++) {
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if (Tkin != preStepKinEnergy && IsIon) {
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chargeSqRatio = currentModel->GetChargeSquareRatio(theDirectPartDef,currentMaterial,Tkin);
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theDirectEnergyLossProcess->SetDynamicMassCharge(massRatio,chargeSqRatio);
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}
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G4double r = theDirectEnergyLossProcess->GetRange(Tkin, currentCouple);
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if( dlength <= linLossLimit * r ) {
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degain = DEDX_before*dlength;
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}
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else {
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G4double x = r + dlength;
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//degain = theDirectEnergyLossProcess->GetKineticEnergy(x,currentCouple) - theDirectEnergyLossProcess->GetKineticEnergy(r,currentCouple);
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G4double E = theDirectEnergyLossProcess->GetKineticEnergy(x,currentCouple);
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if (IsIon){
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chargeSqRatio = currentModel->GetChargeSquareRatio(theDirectPartDef,currentMaterial,E);
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theDirectEnergyLossProcess->SetDynamicMassCharge(massRatio,chargeSqRatio);
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G4double x1= theDirectEnergyLossProcess->GetRange(E, currentCouple);
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while (std::abs(x-x1)>0.01*x) {
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E = theDirectEnergyLossProcess->GetKineticEnergy(x,currentCouple);
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chargeSqRatio = currentModel->GetChargeSquareRatio(theDirectPartDef,currentMaterial,E);
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theDirectEnergyLossProcess->SetDynamicMassCharge(massRatio,chargeSqRatio);
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x1= theDirectEnergyLossProcess->GetRange(E, currentCouple);
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}
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}
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degain=E-Tkin;
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}
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//G4cout<<degain<<G4endl;
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G4double tmax = currentModel->MaxSecondaryKinEnergy(dynParticle);
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tmax = std::min(tmax,currentTcut);
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dynParticle->SetKineticEnergy(Tkin+degain);
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// Corrections, which cannot be tabulated for ions
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//----------------------------------------
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G4double esecdep=0;//not used in most models
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currentModel->CorrectionsAlongStep(currentCouple, dynParticle, degain,esecdep, dlength);
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// Sample fluctuations
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//-------------------
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G4double deltaE =0.;
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if (lossFluctuationFlag ) {
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deltaE = currentModel->GetModelOfFluctuations()->
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SampleFluctuations(currentMaterial,dynParticle,tmax,dlength,degain)-degain;
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}
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G4double egain=degain+deltaE;
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if (egain <=0) egain=degain;
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Tkin+=egain;
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dynParticle->SetKineticEnergy(Tkin);
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}
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delete dynParticle;
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if (IsIon){
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chargeSqRatio = currentModel->GetChargeSquareRatio(theDirectPartDef,currentMaterial,Tkin);
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theDirectEnergyLossProcess->SetDynamicMassCharge(massRatio,chargeSqRatio);
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}
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G4double DEDX_after = theDirectEnergyLossProcess->GetDEDX(Tkin, currentCouple);
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G4double weight_correction=DEDX_after/DEDX_before;
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aParticleChange.ProposeEnergy(Tkin);
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//we still need to register in the particleChange the modification of the weight of the particle
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G4double new_weight=weight_correction*track.GetWeight();
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aParticleChange.SetParentWeightByProcess(false);
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aParticleChange.ProposeParentWeight(new_weight);
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return &aParticleChange;
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}
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///////////////////////////////////////////////////////
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//
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void G4ContinuousGainOfEnergy::SetLossFluctuations(G4bool val)
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{
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if(val && !lossFluctuationArePossible) return;
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lossFluctuationFlag = val;
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}
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///////////////////////////////////////////////////////
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//
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G4double G4ContinuousGainOfEnergy::GetContinuousStepLimit(const G4Track& track,
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G4double , G4double , G4double& )
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{
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G4double x = DBL_MAX;
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x=.1*mm;
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DefineMaterial(track.GetMaterialCutsCouple());
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preStepKinEnergy = track.GetKineticEnergy();
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preStepScaledKinEnergy = track.GetKineticEnergy()*massRatio;
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currentModel = theDirectEnergyLossProcess->SelectModelForMaterial(preStepScaledKinEnergy,currentCoupleIndex);
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G4double emax_model=currentModel->HighEnergyLimit();
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if (IsIon) {
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chargeSqRatio = currentModel->GetChargeSquareRatio(theDirectPartDef,currentMaterial,preStepKinEnergy);
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preStepChargeSqRatio = chargeSqRatio;
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theDirectEnergyLossProcess->SetDynamicMassCharge(massRatio,preStepChargeSqRatio);
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}
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G4double maxE =1.1*preStepKinEnergy;
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/*if (preStepKinEnergy< 0.05*MeV) maxE =2.*preStepKinEnergy;
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else if (preStepKinEnergy< 0.1*MeV) maxE =1.5*preStepKinEnergy;
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else if (preStepKinEnergy< 0.5*MeV) maxE =1.25*preStepKinEnergy;*/
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if (preStepKinEnergy < currentTcut) maxE = std::min(currentTcut,maxE);
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maxE=std::min(emax_model*1.001,maxE);
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preStepRange = theDirectEnergyLossProcess->GetRange(preStepKinEnergy, currentCouple);
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if (IsIon) {
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G4double chargeSqRatioAtEmax = currentModel->GetChargeSquareRatio(theDirectPartDef,currentMaterial,maxE);
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theDirectEnergyLossProcess->SetDynamicMassCharge(massRatio,chargeSqRatioAtEmax);
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}
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G4double r1 = theDirectEnergyLossProcess->GetRange(maxE, currentCouple);
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if (IsIon) theDirectEnergyLossProcess->SetDynamicMassCharge(massRatio,preStepChargeSqRatio);
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x=r1-preStepRange;
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x=std::max(r1-preStepRange,0.001*mm);
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return x;
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}
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#include "G4EmCorrections.hh"
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///////////////////////////////////////////////////////
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//
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void G4ContinuousGainOfEnergy::SetDynamicMassCharge(const G4Track& ,G4double energy)
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{
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G4double ChargeSqRatio= G4LossTableManager::Instance()->EmCorrections()->EffectiveChargeSquareRatio(theDirectPartDef,currentMaterial,energy);
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if (theDirectEnergyLossProcess) theDirectEnergyLossProcess->SetDynamicMassCharge(massRatio,ChargeSqRatio);
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}
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